Activity-Oriented Design of Health Pal: A Smart Phone for Elders' Healthcare Support. - John Kar-Kin Zao; Shih-Chen Fan; Ming-Hui Wen; Chun-Tang Hsu; Chung-Hoo Hung; Shang Hwa Hsu; Ming-Chuen Chuang (EURASIP J. Wirel. Commun. Netw., 2008)